Electric heater



Original Filed Dec. 27. 1927 I VENER BY rW I ATTORNEYS WILBUR STANLEY LE S, 01 LAKEWOOD,

Patented Aug. 2, 1932 UNITED STATE A E T OHIO, AssreNoR T'O TH-I N sr E-L MUa compan o 'nEw YORK, n. a ooRroRn'rIon or onro ELEc'rRrc HEATER Application filed December 27, 1927, Serial No. 242,652. Renewed November 23', 1929:

This invention relates to an'electric heater and is particularly adapted to tubular heaters such as are used in the permanent waving of human hair. a i i i An object of the invention is to provlde-a heater which will be compact, neat in ap-v pearance and easily kept clean.

Another object is to provide a heater whlch may be manufactured of few and simple parts and readily assembled. 7

Other objects will hereinafter appear.

The invention will be better understood from the description of one practical embodiment thereof illustrated in the accompanying drawing in which Figure 1 is a perspective view of the completely assembled heater;

Figure 2 is a central longitudinal section thereof; and

Figure 3 is a diagrammatic representation of the electric circuits of three of the heaters.

As illustrated in Figures 1 and 2 the heater consists of an upper heater unit A and a lower heater unit B, each consisting of a hollow metallic shell containing a winding of resistance wire by which the heat is generated, the two units being spaced apart by a series of pillars or the like, and surrounding central aligned cylindrical spaces in which the strand of hair or the like which is to be heated may be inserted.

The upper unit A consists of a central metallic tube 1, on the exterior of which resistance wire 2 is wound, the wires being suitably insulated from each other and from the tube.

At the ends of the tube caps or rings 3 and 4 of generally U-shaped cross section are placed and support an outer tubular covering 5. The covering 5 is formed at one point, adjacent the top, with an upwardly extending integral lug 6', and the cap 3 at this point is also formed with a corresponding lug 7 the two lugs when the parts are in assembled relation forming a short tubular projection through which conducting cable 8 may be led to the interior of the unit.

Surrounding this tubular extension and attached thereto as by soldering, brasing, or the like, is a threaded ring 9 for the purpose of retaining a tubular insulator 10 provided with internal threads and supporting a conducting cable which leads to the interior of the heater. I I

The lower unit consists of a central tube 11 aligned with tube 1 above described, and upon which a second coil 12 of resistancewire constituting the lower heating element is wound. The upper end of the unit is closed by a cap 13, while the space between the outer periphery of this cap and the lower end of the tube 11 is enclosed within an ogival cover 14. Tubular pillars 15,, shown as, three in number, connect caps 4 and. 13 by being brazed or welded thereto, or by having reduced ends extending through perforations in the caps and being expanded or riveted over. Insulating conductor wires, as 16, supplying current to a coil 12 are ledthrough the tubular pillars as shown. v i

The heater maybe readily assembled, as follows: 1

Tubes 1 and 11 are inserted through the openings in caps 4 and 13 and the ends Ofthe tubes expanded to lock the same to the inner flangesfof these capsvPillars 15 are then interposed between the caps and secured thereto. The coils 2 and 12 are next wound upon the tubes and connected to the conduct ing cable 8. Next cover 14 is placed over tube 11, its upper end seating within cap- 13, and the lower end of tube 11 is expanded to re tain the same in place, and cover 5 is inserted around tube 1 seating within cap 4, cap 3 is slidover the end' of tube 1 with its outer flange overlying the upper end of tube 5, and the upper end of tube 1 is expanded.

Of course, in assembling cap 3 and cover 5 the conductor 8 is positioned between the upwardly extending lugs and after these parts are secured in place ring 9 is slid over the lugs aid brazed thereto. Next, insulator 10 is slid down over' conductor Sand screwed onto ring 9,= after which theouter end of the conductor may be connected in any suitable manner with the apparatus which is to deliver current thereto. 7 Figure 3 shows the circuit ofthree heaters and one manner in which thesa-me may be connected to a source of electricity shown as a generator G, ,The generator" supplies current to two conductors 17 and 18 the first of which is provided with a switch 19 and connected to the adjacent ends of the coils 2 and 12 by wires 20. Conductor 18 is directly'connected by wires 21 to the lower ends of coils 12 and connected through switch 22 and wires 23 to the upper ends of coils 2.

It will be seen that when both switches are,

,bodiment of my invention in some particu larity, obviously many changes and modifications may be made therein'without departing from the spirit of the invention, and'I', therefore, claim all such embodiments coming within the scope of the. appended claims.

I claim:

1. A tubular heater comprising two axially spaced units, each consistingof a coil of conducting wire enclosed within a hollow annular shell, each shell including concentrically arranged inner and outer tubes and perforated caps and united together by the ex; pansion of theends of the inner tubes.

2. A heater consisting oftwo axially aligned units each consisting of a coil of wire inclosed within a shell each including avcentral tube, caps surrounding adjacent ends of said tubes and secured thereto by expansionof said ends, pillars connecting said caps; the caps being provided on their outer periph eries with flanges, tubular cove-rs surrounding said tubes and seating within said flanges, the outer end of one cover being secured to its central tube by expansion of the outer end of the latter, and the outer end of the other cover being received under a flange on the third cap, the inner edge of which is secured to its central tube by expansion of the end thereof. 7 V r 3. A heater comprising two axially aligned units, one'of which consists of a central tube, a coil of resistance wire .wound thereon, a channel-shaped cap carried by the upper end of said tube, a truncated ogival cover having its base seated within the outer flange of said cap and its opposite end secured to said tube by expansion of the lower, end-thereof, a plurality of posts connected tosaid oap,.a second U-shaped cap. connected to said posts, a second central tube connected tosaid cap and supporting a second coil ofresi s-tance wire, a third U-shaped cap supported by th'e'other end of said second tube, a tubular cover retained between the outer flanges of the sec- 0nd and third caps, outwardly extending lugs on the end of said third cap and the tubular forming the wall of such passageway, a separateouter casing surrounding each coil, caps t each end of one coil and at the inner end of the other connecting said inner and outer cas1-11gs, ..,mechan1cal and electrical connectionsbetween said' elements at their adjoining-ends, hollow l-ugson the exposed end of one element, an insulating tube of still insulating material passing therethrough, a cable comprisingconductors to each of said elements=passing through said tube, and an enlarged insulating bushing surrounding said tube, said bushing being secured at one end to said lugs and'on the other-end embracing said cable closely.

j Intestimony whereof I hereunto aflix my signature this 20 day of December, 1927.

WILBUR STANLEY LEWIS. 

